• MultiPortal Version: 1.2.1
• Proxmox VE Version: 9.2.6
• Deployment Type: HA Cluster

Description
We are integrating MultiPortal with an existing ITSM system using the OAuth 2.0 client credentials flow.

The ITSM system sends token requests with the content type:

application/x-www-form-urlencoded

However, the MultiPortal endpoint /access/get-token currently only accepts:

multipart/form-data

This content-type mismatch prevents the ITSM system from completing the OAuth authentication flow.

Expected Behavior
The endpoint /access/get-token should accept valid OAuth 2.0 token requests encoded as application/x-www-form-urlencoded, including client credentials sent in the request body.

Support for the existing multipart/form-data format should remain available for backward compatibility.

Actual Behavior
The endpoint /access/get-token only accepts requests encoded as multipart/form-data.

Requests sent with application/x-www-form-urlencoded are rejected, preventing the ITSM system from completing the OAuth 2.0 client credentials flow.